Malicious PDF — malware analysis report

Static analysis result for SHA-256 192d0990e7a5f653…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 02:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975c600e74682513b85bcf4437bbfd8d SHA-1: 2b78f00fa797488564753d807dd4f129f0b93a7a SHA-256: 192d0990e7a5f653aed62a266df672a54bd796f3864a9d74978dd1b5b3477965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=religion+in+the+jacobean+era
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22f0e6c3---60278344725.pdf
    • http://surestegc.org/documentos/file/59619408825.pdf
    • http://dga.gr/ILC/img/file/logesasuwezasezako.pdf
    • https://trompis-tondschungel.de/userfiles/file/61881186425.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137befe0cb24---nomaserezoz.pdf
    • https://dolmalatrek.com/userfiles/file/rovorazuzola.pdf
    • http://audiohrestomatiya.ru/content/file/2966274718.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/putuzapunon.pdf
    • http://progettogeometra.it/userfiles/files/ledukumosofisonewani.pdf
    • http://dkkarsin.pl/img/upload/files/9035815647.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/23464939627.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/wonemijozoxotuz.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/junamogodezidebikajak.pdf
    • https://driftwoodcc.com/userfiles/files/gikowizorewifojaveba.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16138575e45288---kobobefoxofo.pdf
    • http://chi-kara.net/userfiles/file/kexeje.pdf
    • http://domario.ru/userfiles/file/94260442360.pdf
    • http://gniortho.com/files/Upload/file/11361521663.pdf
    • http://www.hgbehringer.de/img/files/files/lopexajaxakodojasonozafi.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137a183975ff---81724861766.pdf
    • https://luiginoiobbi.com/userfiles/file/98206823353.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/modoluwifafo.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/wofevuzotodejowi.pdf
    • https://gsm.company/ckfinder/userfiles/files/ruduvobu.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/nesofumebidepekolakizi.pdf
    • https://toppelletmachine.com/d/files/numonurigekenutas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16792 bytes
font_01_sfnt_off0000dc92.bin
65c573f536bae253b8d33754fde77f5fba37f8ac3f5854b9c32e0d203ac4f0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 17464 bytes
font_02_sfnt_off00010981.bin
7bbd2ec98258e032a3c933ed7a7053273490c8ba99aeb130277fd38c6f9343ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10656 bytes